Other than the reasons stated to run the generator there's also a great reason to run it regularly, experience. And by that I mean there were conditions we only caught with our data center generators because we exercised them weekly, like finding out that they don't like to start at -5F without a block heater and battery heater pad, or that in super humid conditions the slats in the vandal covers needed to open more or it ran like a poorly tuned truck. All of that tuning only happened because we excercised them regularly so when we actually need them we never had an issue.
